1690050881 has 2 divisors, whose sum is σ = 1690050882. Its totient is φ = 1690050880.

The previous prime is 1690050853. The next prime is 1690050913. The reversal of 1690050881 is 1880500961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1649090881 + 40960000 = 40609^2 + 6400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690050881 - 2¹⁰ = 1690049857 is a prime.

It is a super-2 number, since 2×1690050881² = 5712543960737752322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1690050841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845025440 + 845025441.

It is an arithmetic number, because the mean of its divisors is an integer number (845025441).

Almost surely, 2^1690050881 is an apocalyptic number.

It is an amenable number.

1690050881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690050881 is an equidigital number, since it uses as much as digits as its factorization.

1690050881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 1690050881 is about 41110.2284231066. The cubic root of 1690050881 is about 1191.1503789846.

The spelling of 1690050881 in words is "one billion, six hundred ninety million, fifty thousand, eight hundred eighty-one".